If 条件状语从句练习题

If 条件状语从句练习题

1. If he hard, he will get good grades.

A. study

B. studies

C. will study

D. studied

2. Everyone must dress up. If you ,they won’t let you in.

A. don’t

B. won’t

C. can’t

D. mustn’t

3. Mary will go to Sanya if she a five-day trip.

A. have

B. had

C. will have

D. has

4. If he comes late, he will miss the train.

A. and

B. so

C. /

D. or

5. If you _____ to the party, you’ll have a great time.

A. will go

B. went

C. go

D. going

6.I ____ her the answer if she ____me.

A. can tell, will ask

B. will tell, will ask

C. would tell, ask

D. will tell, asks

7. – What are you going to do tomorrow?

--We’ll go to the library tomorrow if it ___.

A. isn’t rain

B. rain

C. won’t rain

D. doesn’t rain

8. What will you do if you _____ to the old folk’s home visit?

A. go

B. went

C. going

D. will go

9. I’ll give the book to him if he ___ here next Sunday.

A. will come

B. comes

C. is coming

D. came

10. I’ll wake you up when he ____back.

A. will

B. is going to come

C. comes

D. come

二、用所给词的适当形式填空

1. If you ____（feel) tired, you ____ ____ (have) to have a rest.

2. Where _____ he ____(see) the film if he _____(have) time?

3. If there ____ (be) fewer trees, there ______ ____ (be) more pollution.

4. He will dress___ (dress)more casually（偶然） if he ____ ____ (not

work) on weekends.

5. If Marcia ______ (live) alone, she ____ _____ (keep) a pet parrot.

6. Lana ____ ____(buy) a new dress if the old one ____(be) out of style.

7. The twins _____ ____ (fight) if they_____ (argue).

8. I _____ ____ (have) a bake sale if I ____ (need) money for education.

9. Peter ____ ____ (send) me a beautiful souvenir if he ____(tour)

Spain.

10. If Mr. Green ______ (say) I am hard- working, my parents ____

____ (feel) glad.

11. I ____ ____ (go) to the beach if it____ ____ (not rain) this week.

12. ____they ____ (have) a match if the P.E. teacher____ (be) busy?

13. He ____ ____ (write) a letter to his grandparents if he ____ (get)

his report card this week.

14. If she ____ (get) up late, she ____ ____(not catch) the early bus.

三、翻译下列句子

1.如果你打碎玻璃，你将不得不赔偿.

2.如果你不快点的话，我们将误了火车。

3.如果他摔倒了，他将摔伤他自己.

4.如果明天下雨，我们就不去海边了.

5.如果你感到好多了的话，你就能起床了.

6.如果他卖了车的话，他就能够买一辆新的.

7.如果我赢了很多钱的话，我就给你买个貂皮大衣。

8.如果我们赢了很多钱的话，我们将周游世界并且住最好的宾馆。然后返回家，在乡下买一幢大房子。

9.如果我们把所有钱花光，我们又会变穷的。

10.如果我们花光所有的钱，我们设法在足球赛赌上再赢一次.

if引导的条件状语从句练习题

If条件状从句练习 1. If there no buying and selling of animals, there no killing in nature. A. is; will he B. will be; will be C. is; is D. will be; is 2. I’m waiting for my friend._, I'll go shopping alone. A. If she comes B. If she won't come C. If she doesn't come 3.The students ____ have a sports meeting this weekend if it _____。A. won’t; rains B. will; rains C. won’t; will rain D. are going to; is going to rain 1.If you _____ to the party, you’ll have a great time A. will go B. went C. go D. going 2.–What are you going to do tomorrow? --We’ll go to the library tomorrow if it ___. A. isn’t rain B. rain C. won’t rain D. doesn’t rain 3. What will you do if you _____ to the old folk’s home visit? A. go B. went C. going D. will go 4. If I eat ____ food, I’ll be very fat. A. too many B. many too C. too much D. much too 5. I’ll give the book to him if he ___ here next Sunday. A. will come B. comes C. is coming D. came 6. I ____ her the answer if she ____me. A. can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks 7. We’ll go to the farm and help the farmers with the apple-picking if it ____ tomorrow. A. won’t rain B. will be rainy C. doesn’t rain D. isn’t raining 8. There is going to _______ a sports meeting next week. If it ________, we’ll have to cancel it. A. be, will rain B. have, will rain C. be, rains 9. Y our teacher will be unhappy if you _______ to school late. A. come B. will come C. are coming D. came 10．I don’t know if he __. If he __ , please let me know. A. comes, comes B. will come, will come C. will come, comes D. comes, will come 11．Y ou will stay healthy _______ you do more exercise, such as running and walking. A. if B. how C. before D. where 12.If she here tomorrow, I will tell you. A. comes B. will come C. come D. came 13. I’m waiting for my friend. , I’ll go shopping alone. A. If she comes B. If she doesn’t come C. If she won’t come 14. —Tom wants to know if you will have a picnic tomorrow. —Y es. But if it ______, we’ll play chess instead. A. will rain B. rained C. is raining D. rains 15. If Tom _____ the game, we'll give him a surprise". A. win B. wins C. won D. miming 二、用所给词的适当形式填空。 1.If you ________(feel) tired, you _________ (have) to have a rest. 2. Where _____ he ____(see) the film if he _________(have) time? 3. If there ____(be) fewer trees, there _______( be) more pollution. 4. He ___(dress) more casually if he ___( not work) on weekends. 5. If Marcia _______(live) alone, she _______( keep) a pet parrot. 6. Lana _____ buy) a new dress if the old one ____(be) out of style. 7.The twins _______(fight) if they__________(argue). 8. I ______(have) a bake sale if I ____(need) money for education.

让步、条件状语从句

条件状从和让步状从练习 一．单选题 1._______ the forest park is far away, a lot of tourists visit it every year. A. As B. When C. Even though D. In case 2. The experiment shows that proper amounts of exercise, if ______ regularly, can improve our health. A. being carried out B. carrying out C. carried out D. to carry out 3. You will never gain success you are fully devoted to your work. A. when B. because C. after D. unless 4. It is hard for the Greek government to get over the present difficulties_________ it gets more financial support from the European Union. A. if B. unless C. because D. since 5. It was a nice meal, _______a little expensive. A. though B. whether C. as D. since 6. I don’t really like the author,_______ I have to admit his books are very exciting. A. although B. unless C. until D. once 7. I don't believe we've met before, _____ I must say you do look familiar. A. therefore B. although C. since D. unless 8. You can’t borrow books from the school library ______ you get your student card. A. unless B. if C. while D. as 9. I'll be out for some time. ______ anything important happens, call me up immediately. A. In case B. As if C. Even though D. Now that 10. One's life has value ____one brings value to the life of others. A. so that B. no matter how C. as long as D. except that 二．填空题 11. In the global economy, a new drug for cancer, ______ it is discovered, will create many economic possibilities around the world. 12. One can always manage to do more things, ____ full one’s schedule is in life. 13.________ great difficulties we are faced with, we’ll never give up. 14. ________ great the difficulties are, we’ll never give up. 15. ______ we have enough evidence, we can't win the case. 16. If _____ to look after luggage for someone else, inform the police at once. (ask) 17.____________ the weather is like tomorrow, I will set out for Hongkong. 18. Many of them turned a deaf ear to his advice ___________ they know it to be valuable. 19. Much ______ I admire David as a poet, I don’t like him as a man. 20. In time of serious accidents, ______ we know some basic things about first aid, we can save lives. 三．改错题 21、It won’t matter even he refuses. 22. Though the work was difficult, but we managed to finish it in time. 23. I’m not going to talk on the point any further, though it is neither important nor very interesting. 24. You will be late if you leave immediately. 25. Take an umbrella with you in case of it should rain.

if引导的条件状语从句讲解和练习(答案)

t 条件状语从句 一、 条件状语从句通常由 if （如果）, unless （除非），as long as （只要）引导。 例如：If it rains tomorrow, we won ’go to the park. 如果明天下雨，我们就不去公园了。 Unless weather stops me, I go for a walk every. 我每天都会去散步，除非遇上坏天气。 Our parents will be pleased with our performance as long as we try our best. 小试牛刀：1、只要我们竭尽全力，父母就会满意我们的表现。 Our parents will be pleased with our performance _____ _____ ______ we try our best. 2、如果人人为保护环境做出贡献，世界将会变得更美好。______ ______ ______ _____ _______ to protecting the environment, the world will become much more beautiful. 二、if 引导的条件状语从句 （1）“if 从句+祈使句”的句子。其实，if 作为一个连词，主句也可以是其他形式的句子。 例如：If you want to go, please let me know. If the green light isn ’t on, wait for a minute. (2)“祈使句 + and (or)+ 陈述句” 在意思上相当于一个带有条件状语从句的复合句。 注意：A. “祈使句 + and + 陈述句”可以转化为 if 引导的肯定条件状语从句，而且主语是第二人称。 B. “祈使句 + or + 陈述句”可以转化为 if 引导的否定条件状语从句，而且主语是第二人称。 例如：Study hard and you will pass the exam. =If you study hard, you will pass the exam. Hurry up, or you ’ll be late. =If you don ’t hurry up, you ’ll be late. 考题 (2010 重庆中考)Work hard ，________ you may catch up with your classmates soon. A.or B.but C.and D.yet 思路解析：本句是“祈使句＋and”的句型，句意为“努力学习，你会很快赶上其他同学的”，and 在句中表示承接 关系，所以选 C 项。答案：C 黑色陷阱：本题的陷阱是句型，本句型区别于“祈使句＋or”，这个句型的含义是“……，不然的话/否则……”。 绿色通道：祈使句后面既可以加 and ，也可以加 or ，所以要全面分析句意，再作决定。 小试牛刀：用 if 连接下列句子 1、Go to bed early and you will have a good rest. 2、Hurry up, or you ’ll miss the bus. 三、if 从句与主句具有以下特点： 1．If 从句中用一般现在时，表示未来的一种条件，从句中可以加时间状语。 e.g.If yo u can’t come tomorrow, we can hold the party a little later.明天你如果不能来，我们可迟一点举行宴会。

if条件状语从句练习及答案

if_条件状语从句的时态练习及答案_初中习题集 I.单项选择 1.If you _____ to the party, you’ll have a great time. a. will go b. went c. go d. going 2.It will be a long time ____ peter _____ his work. a. since, has finished b. after, finishes c. when, will finish d. before, finishes. 3. what will father _____ us from Japan? a. take b. bring c. carry d. make 4. Weifang is famous ______ kites a. for b. to c. on d. with 5． I____ her the answer if she ____me. a. can tell, will ask b. will tell, will ask c. would tell, ask d. will tell, asks 6. – what are you going to do tomorrow? --we’ll go to the library tomorrow if it ___. a. isn’t rain b. rain c. won’t rain d. doesn’t rain 7.—Do you know when he will come back tomorrow? --sorry, I don’t know. when he ____ back, I’ll tell you. a. comes b. will come c. come d. may come 8. what will you do if you _____ to the old folk’s home visit? a. go b. went c.going d. will go 9. If I eat ____ food, I’ll be very fat. a. too many b. many too c. too much d. much too 10.I’ll give the book to him if he ___ here next sunday. a. will come b. comes c. is coming d. came 11. There ____an english film in our school tomorrow. a. is going to have b. will have c. is going to be d. has 12.Could you tell us where ____？ a. will the next olympic games held b. the next olympic games will be held c. would the next olympic games be held d. the next olympic games would be held 13. When my mother returned last night,I ____ a book. a. read b. am reading c. was reading d. am going to read 14. What ____ you ____ when it began to rain? a. do, do b. were, doing c. are, doing d. did, do 15. I’ll wake you up when he ____back. a. will b. is going to come c. comes d. come II、用所给词的适当形式填空 1.If you _______(feel) tired, you ______(have) to have a rest. 2. Where _____ he ______(see) the film if he ________(have) time?

初中英语条件状语从句语法详解

初中英语条件状语从句语法详解 (名师剖析语法知识点+ 实战训练题，值得下载打印) 一．条件状语从句的概念 条件状语从句，即在某种条件下，一件事情可能发生。在英语中由连接词if或unless等 引导的状语从句叫做条件状语从句。条件是指某一件事情实现之后（状语从句中），一件事 情（主句）才能发生，通常译作“假如，只要，如果”等意思。条件状语从句中，主从句的时 态要遵循“主将从现”的原则。即，主句是将来时态时，从句用一般现在时代替将来时态。 二.条件状语从句的引导词 1.If conj . 如果，假如 If you ask him，he will help you．如果你请他帮忙，他会帮你的。 If you fail in the exam，you will let him down．如果你考试不及格，你会让他失望的。 2.unless conj.除非,若不,除非在……的时候（if ...not...） You will fail to arrive there in time unless you start earlier. 如果你不早点动身,你就不能及时赶到那儿。Unless it rains, the game will be played. 除非下雨,比赛将照常进行。 3.so/as long as conj.只要 You may borrow my book as long as you keep it clean. 只要你保持书的清洁，你就可以把我的书借去。 三．关于条件句的时态，常见的有以下三种情况： 1、条件状语从句的主句是一般将来时，那么从句常常用一般现在时。 When I grow up, I’ll be a nurse and lo ok after patients. 我长大后要当一名护士，照顾病人。 2、如果主句是祈使句，那么从句通常要用一般现在时。 If you want to have a chat ,call me up. 如果你想聊天，打我电话。

If引导条件状语从句的详细用法解答

If引导条件状语从句的详细用法解答 引导条件状语从句最常用的连词是if，常见的if条件状语从句表示在某条件下，某事很可能发生，条件是可能存在的，主句中某种情况发生的概率也是很高的。如： If you ask him，he will help you．如果你请他帮忙，他会帮你的。 If you fail in the exam，you will let him down．如果你考试不及格，你会让他失望的。 If you have finished the homework，you can go home．如果你作业做完了就可以回家了。 另外，if从句还表示不可实现的条件或根本不可能存在的条件，也就是一种虚拟的条件或假设。从句多用一般过去时或过去完成时，表示对现在或过去的一种假设。如： If I were you，I would invite him to the party．如果我是你，我会邀请他参加聚会。 I would have arrived much earlier if I had not been caught in the traffic．要不是交通堵塞，我本会来得早一些。 另外你还要注意if 条件句的时态搭配 1．if从句用一般现在时，主句用一般将来时 If he runs he’ll get there in time. 如果他用跑的，他就会及时赶到那儿。 The cat will scratch you if you pull her tail. 如果你拉猫的尾巴，它就会抓你。2．if从句用一般现在时，主句用may/might/can If the fog gets thicker the plane may/might be diverted. 如果雾在大一些，飞机可能就会改在别的机场降落。 If it stops snowing we can go out. 如果雪停了，我们就可以出去。 3．if从句用一般现在时，主句用must/should If you want to lose weight you must/should eat less bread. 如果你想减肥，你必须少吃面包。 4．if从句用一般现在时，主句用一般现在时 If you heat ice it turns to water. (也可用will turn)如果把冰加热，它就会化成水。5．if从句用现在进行时，主句用一般将来时 If you are looking for Peter you’ll find him upstairs. 如果你是在找彼得，上楼就会找到他。 6．if从句用现在完成时，主句用一般将来时 If you have finished dinner I’ll ask the waiter for the bill. 如果你吃完了，我就叫服务生来算账 注意： 学习" if " 引导的条件状语从句的用法,现在总结一下: if 条件句不一般,几个要点记心间; 条件句,放在前,逗号要放句中间。 条件句表可能，主句多用将来时； 条件句表事实，主句常用现在时。

if引导条件状语从句讲解与练习-2

在if 引导的条件状语从句中，if 和条件句位置灵活，可直接放在主句后面，若if 条件句放句首，从句后面要加逗号，和主句隔开。还要注意前后时态一致原则 一、用所给词的适当形式填空 1.If you ________(feel) tired, you _______________ (have) to have a rest. 3. If there __________(be) fewer trees, there _______________( be) more pollution. 5. If Marcia _____________(live) alone, she ___________________( keep) a pet parrot. 6. Lana ________________( buy) a new dress if the old one ____________(be) out of style. 9. Peter _____________( send) me a beautiful souvenir if he ________________(tour) Spain. 10. If Mr Green ___________(say) I am hard- working, my parents _________( feel) glad. 11.I ____________(go) to the beach if it________________ ( not rain) this week. 13.He ____(write) a letter to his grandparents if he ____(get) his report card this week. 14. If she ____________(get) up late, she _____________ ( not catch) the early bus. 15. Peter ________(major) in English if he ____(pass) the exams in Peking University. 16. 如果努力学习，你就会取得好成绩。 If you__________ _________, you ___________ good _____________. 17. 他如果看电视太久了，他的父母会不高兴。 If he _________ TV too much, his parents __________ __________ unhappy. 18. 如果我们为他组织生日聚会，大家都会来的。 Everyone ________________ if we _____________ a birthday party __________ him. 19. 如果明天不下雨，我会和你一起去公园的。 If it __________ __________ tomorrow, I ______________ go to the park _________ you. 21. 如果他有空，他会帮助你的。 If he _________________, he _________________ you. 23. 你如果抄同学的作业就不能学好各门功课。 You _______ _____ good at all the subjects if you ______ the other students’ homework. Ⅰ.单项选择（15分） 1.If you _____ to the party, you’ll have a great time. A. will go B. went C. go D. going 2. It will be a long time ____ Peter _____ his work. A. since, has finished B. after, finishes C. when, will finish D. before, finishes. 3. What will father _____ us from Japan? A. take B. bring C. carry D. make 4. Weifang is famous ______ kites. A. for B. to C. on D. with 5．I ____ her the answer if she ____me. A. can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks 6. – What are you going to do tomorrow? --We’ll go to the library tomorrow if it ___. A. isn’t rain B. rain C. won’t rain D. doesn’t rain 7.—Do you know when he will come back tomorrow? --Sorry, I don’t know. When he ____ back, I’ll tell you. A. comes B. will come C. come D. may come 8. What will you do if you _____ to the old folk’s home visit? A. go B. went C.going D. will go 9. If I eat ____ food, I’ll be very fat.

高中英语语法---条件状语从句讲解

条件状语从句 概念定义 由引导词if或unless引导的状语从句叫做条件状语从句。在英文中，条件是指某一件事情实现之后（状语从句中的动作），其它事情（主句中的动作）才能发生，通常译作“假如”。（注意：在含有条件状语从句的复合句中，表示将来时态，主句是一般将来时态,祈使句或情态动词，从句要用现在时态,[主将从现原则]（主将从现，将并非指将来时，还指表示将来含义的，跟着if后的那句话是从句。） 类型 条件状语从句 语法引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如： 1） If you ask him,he will help you. 如果你请他帮忙，他会帮你的。 2） If you fail in the exam,you will let him down. 如果你考试不及格，你会让他失望的 if引导的条件状语从句既可以将从句放前面也可以将从句放后面 （如果天下雨，我们就不玩了）If it rains,we will stop playing.‘ 转为We will stop playing if it rains. if引导的条件状语从句

另外，if从句还表示不可实现的条件或根本不可能存在的条件，也就是一种虚拟的条件或假设，从句多用一般过去时或过去完成时。如：If I were you,I would invite him to the party.如果我是你，我会邀请他参加聚会。I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车，我会到的早一点儿。 那么，除了if之外，是否还有其他连词也可以引导条件状语从句呢?回答是肯定的，不仅有，还有很多。这些词由于出现的频率较小，且用法较复杂一些，所以不如if为大家所熟知罢了。下面就这些词的用法以例句的形式进行一下简单总结。 1、unless conj.除非，若不，除非在……的时候 You will fail to arrive there in time unless you start earlier.如果你不早点动身，你就不能及时赶到那儿。 Unless it rains,the game will be played.除非下雨，比赛将照常进行。 2、on condition(that)...在……条件下，如果 on condition (that)...引导的条件从句是主句事件发生的前提条件或唯一条件。 I can tell you the truth on condition that you promise to keep a secret.我可以告诉你真相，条件是你答应保密。 You can go swimming on condition (that) you don't go too far from the river bank.你只有在不远离河岸的条件下才可以下水游泳。 3、supposing conj.如果，假如 supposing引导的条件从句表示一种假设条件。 Supposing it rains,shall we continue the sports meeting?倘若下雨，我们的运动会还要继续举行吗? Supposing anything should go wrong,what would you do then?假如出了什么问题，你准备怎么对付?

if引导的条件状语从句知识点及练习题

if引导的条件状语从句 （一）定义 if引导的句子在复合句中表示条件，假如if从句的动作发生，主句的动作就（不）会发生，因此称为条件状语从句。 （二）位置 if 引导的条件状语从句位置灵活，可直接放在主句后面，也可以放在句首。放在句首时，从句后面要用逗号和主句隔开。 ① If I have enough money, I will travel around the world. ② I will travel around the world if I have enough money. （三）用法 ① Work hard, and you?ll pass the exam easily. 努力学习，你将很容易通过考试。 →If you work hard, you?ll pass the exam easily. ② Hurry up, or you?ll miss the train. 快点儿，否则你就赶不上火车了。 →If you don?t hurry up, you?ll miss the train. （3）当主句含有情态动词时，if引导的条件状语从句通常用一般现在时。 We must study hard if we want to pass the final exam. 如果想通过期末考试，我们必须努力学习。 （4）用含介词with或without的介词短语转换。 ① If you help me, I'll finish my job soon. →With your help, I'll finish my job soon. 如果你帮我，我将很快完成我的工作。 ② If there is no water, fish can?t live. → Fish can?t l ive without water. 离开水，鱼不能生存。 （四）if引导的条件状语从句与if引导的宾语从句的区别 if引导宾语从句时表示“是否”，位于及物动词之后； if引导的条件状语从句时表示“假如，如果”，位于句首或句中。 ①I don't know if he will come tomorrow. ②If he comes, I'll call you. 练习 一、选择题 1. _____ you don't go to bed earlier, you will feel tired in the morning. A. Unless B. If C. Though D. Until 2. Why not look up the new word in a dictionary _____ you don't know it? A. if B. that C. though D. whether 3. Talk to your teacher and you will get help _____ you have a problem. A. unless B. if. C. until D. so 4. I won't go to tomorrow's party _____ I'm invited. A. if B. unless C. when 5. The children will climb the hill if it _____ tomorrow.

when时间状语从句讲解教案教程文件

资料收集于网络，如有侵权请联系网站删除状语从句之时间状语从句 一．概念及分类名。复合句中从句可分为定语从句，和句子可以分为简单句，并列句复合句词性从句和状语从句。 用来修饰谓语动词，其他动词，定语，状语或整个句子的从句叫做状语从句。状语从句可分为：时间状语从句、地点状语从句、原因状语从句、条件状语从句、目的状语从句、让步状语从句、比较状语从句、方式状语从句、结果状语从句。 DaMing is a brave boy. DaMing is a brave boy and he always does something special. DaMing is a brave boy, who always does something special.

可编辑word 资料收集于网络，如有侵权请联系网站删除二，时间状语从句 When, while, as, before, after, since, 引导时间状语从句的连接词一般有等。，until/tillas soon as When 观察下面例句，总结其用法 1.When he was a child he was always trying out new ideas. 他小时候就常常试验一些新的设想。 2. When she came into my room, I was just reading a book. 她走进我房间时，我正在看书。 3. Were you writing when the teacher came in? 老师进来的时候，你在写信吗？ 4. Sorry, I was out when you called me. 对不起，你打电话来的时候我出去了。 总结：从句表示动作可以______________也可以_________________,主句和从句的先后关系_______________________________________ When从句一般用于过去时比较多，主句无时态限制。 练习 Eg: When I got to the airport, the guests had left. 当我赶到飞机场时，客人们已经离开了。 可编辑word 资料收集于网络，如有侵权请联系网站删除When he had finished his

If条件状从句练习

初中英语――if引导的条件状语从句 引导条件状语从句最常用的连词是if，常见的if条件状语从句表示在某条件下，某事很可能发生，条件是可能存在的，主句中某种情况发生的概率也是很高的。如： If you ask him，he will help you．如果你请他帮忙，他会帮你的。 If you fail in the exam，you will let him down．如果你考试不及格，你会让他失望的。 If you have finished the homework，you can go home．如果你作业做完了就可以回家了。 另外，if从句还表示不可实现的条件或根本不可能存在的条件，也就是一种虚拟的条件或假设。从句多用一般过去时或过去完成时，表示对现在或过去的一种假设。如： If I were you，I would invite him to the party．如果我是你，我会邀请他参加聚会。 I would have arrived much earlier if I had not been caught in the traffic．要不是交通堵塞，我本会来得早一些。 另外你还要注意if 条件句的时态搭配 1．if从句用一般现在时，主句用一般将来时 If he runs he’ll get there in time. 如果他用跑的，他就会及时赶到那儿。 The cat will scratch you if you pull her tail. 如果你拉猫的尾巴，它就会抓你。 2．if从句用一般现在时，主句用may/might/can If the fog gets thicker the plane may/might be diverted. 如果雾在大一些，飞机可能就会改在别的机场降落。 If it stops snowing we can go out. 如果雪停了，我们就可以出去。 3．if从句用一般现在时，主句用must/should If you want to lose weight you must/should eat less bread. 如果你想减肥，你必须少吃面包。4．if从句用一般现在时，主句用一般现在时 If you heat ice it turns to water. (也可用will turn)如果把冰加热，它就会化成水。 5．if从句用现在进行时，主句用一般将来时 If you are looking for Peter you’ll find him upstairs. 如果你是在找彼得，上楼就会找到他。6．if从句用现在完成时，主句用一般将来时 If you have finished dinner I’ll ask the waiter for the bill. 如果你吃完了，我就叫服务生来算账 注意： 学习" if " 引导的条件状语从句的用法,现在总结一下: if 条件句不一般,几个要点记心间; 条件句,放在前,逗号要放句中间。 条件句表可能，主句多用将来时；条件句表事实，主句常用现在时。 在if 引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。如： We can walk there if we can't find a bus . If it rains tomorrow ,we will not go to the zoo. What will you do if you find a panda in danger. 如果if 条件句谈论的是重复发生和预示要发生的情景和事件，则主从句大多用一般现在时态。如： If bears are in danger ,they attack people. 在if 引导的条件状语从句中，if 和条件句位置灵活，可直接放在主句后面，若if 条件句放句首，从句后面要加逗号，和主句隔开。还要注意前后时态一致原则